IC 3143

IC 3143 is a spiral galaxy in the constellation Coma Berenices about 325 million ly from Earth. It spans roughly 60,000 ly, about 60% of our Milky Way's width. The light reaching us tonight left it about 325 million years ago.

Because its light is 325 million ly from home, you are seeing IC 3143 as it looked roughly 325 million years ago. The photons left before that much of history had passed, and are only now reaching us. This distance is estimated from the galaxy's redshift, so the lookback time is approximate.

Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).